CN203982237U - The anti-condensation supervising device of transformer station - Google Patents

Abstract

The utility model relates to an anti-condensation monitoring device for a substation. It includes a main control module and a multi-way selector switch connected to the main control module, a heater module, an alarm module and a communication module for communicating with an upper computer, and also includes a power supply module for supplying power to the entire device. The module is also connected to the clock line of a temperature and humidity sensor module, and the multi-way selector switch is also connected to the data line of the temperature and humidity sensor module; The first temperature and humidity sensor for room temperature and humidity and the second temperature and humidity sensor for collecting low-voltage power distribution room temperature and humidity in the box-type substation. The utility model controls the heating of the box-type substation by the heater module by collecting the temperature and humidity in the box-type substation, which can effectively prevent the occurrence of condensation in the cabinet of the box-type substation, and improves the reliability and safety of the box-type substation operation.

Description

Substation anti-condensation monitoring device

technical field

The utility model relates to an anti-condensation monitoring device, in particular to a substation anti-condensation monitoring device for a box-type substation.

Background technique

With the rapid development of China's urban modernization and the continuous renovation of urban distribution networks, box-type substations have been widely used due to their compactness. However, when the moisture content in the air reaches a certain level, the box-type substation may condense at a lower temperature, which will cause corrosion, cause a decrease in insulation capacity, and affect its mechanical and electrical performance. In addition to causing economic losses, even It may cause creeping discharge on the surface of the insulating part and cause an accident. Therefore, doing a good job in the anti-condensation work of the box-type substation will be a necessary measure to ensure the safe operation of the power grid.

Our country has decades of history in solving the problem of anti-condensation in switchgear. At present, heating and dehumidification methods are widely used in substations, but most of them have the following deficiencies: the anti-condensation controller itself lacks effective monitoring and control methods, and it is difficult to monitor the operating status of heating and dehumidification equipment; The AC 220V power supply takes power, and the heating plate is controlled by the thyristor to dehumidify. This mode has no electrical isolation, and there are potential safety hazards; the traditional heating controller needs to be switched on and off manually, which increases the workload of the operating personnel.

Contents of the invention

The purpose of the utility model is to provide a substation anti-condensation monitoring device, which has a simple circuit structure and is easy to implement.

In order to achieve the above purpose, the technical solution of this utility model is: a substation anti-condensation monitoring device, including a main control module and a multi-channel selection switch connected to the main control module, a heater module, an alarm module and an upper computer. The communication module for communication also includes a power supply module for supplying power to the entire device, the main control module is also connected to the clock line of a temperature and humidity sensor module, and the multiplex switch is also connected to the temperature and humidity sensor module The data line; the temperature and humidity sensor module includes a first temperature and humidity sensor for collecting the room temperature and humidity of the high-voltage power distribution in the box-type substation and a second temperature and humidity sensor for collecting the room temperature and humidity of the low-voltage power distribution in the box-type substation Humidity Sensor.

In the embodiment of the utility model, the main control module adopts a PIC16F887 chip, and adopts a 4MHz crystal oscillator, and is equipped with a crystal oscillator circuit and a reset circuit.

In the embodiment of the present utility model, the first temperature and humidity sensor and the second temperature and humidity sensor both adopt the SHT11 intelligent temperature/humidity sensor.

In the embodiment of the utility model, the multi-channel selection switch adopts CC4051 analog switch.

In the embodiment of the utility model, the communication module adopts MAX1487.

In the embodiment of the present utility model, the power module includes an AC220V power supply for supplying power to the heater module and a first to second power conversion circuit; the first power conversion circuit is used to convert AC220V into DC5V, And supply power for the main control module, communication module and multi-way selection switch; the second power conversion circuit is used to convert the DC5V output by the first power conversion circuit into DC3.3V, and provide the first temperature The humidity sensor and the second temperature and humidity sensor are powered.

In the embodiment of the utility model, the first power conversion circuit adopts a transformer and a three-terminal voltage stabilizing integrated circuit 7805; the second power conversion circuit adopts AMS111733.

Compared with the prior art, the utility model has the following beneficial effects: the circuit structure of the utility model is simple and easy to implement; the device of the utility model controls the temperature and humidity of the heater module through the main control module by collecting the temperature and humidity in the box-type substation. The heating of the box-type substation can effectively prevent the occurrence of condensation in the cabinet of the box-type substation, and improve the reliability and safety of the box-type substation operation.

Description of drawings

Figure 1 is a schematic diagram of the substation anti-condensation monitoring device.

Figure 2 is a voltage stabilization circuit diagram of DC12V to DC5V.

Figure 3 is a working circuit diagram of the heater module.

Figure 4 is a circuit diagram of the connection between SHT11 and the microcontroller.

Figure 5 is a circuit diagram of the connection between the temperature and humidity sensor and the microcontroller.

Figure 6 is a circuit diagram of the connection between the communication module and the microcontroller.

Detailed ways

Below in conjunction with accompanying drawing, the technical solution of the utility model is described in detail.

A substation anti-condensation monitoring device of the present invention includes a main control module and a multi-channel selection switch connected to the main control module, a heater module, an alarm module and a communication module for communicating with an upper computer, and also includes a For the power supply module that supplies power to the entire device, the main control module is also connected to the clock line of a temperature and humidity sensor module, and the multiplex switch is also connected to the data line of the temperature and humidity sensor module; the temperature and humidity sensor The module includes a first temperature and humidity sensor for collecting the room temperature and humidity of the high-voltage power distribution in the box-type substation and a second temperature and humidity sensor for collecting the room temperature and humidity of the low-voltage power distribution in the box-type substation.

The main control module adopts a PIC16F887 chip, and adopts a 4MHz crystal oscillator, and an external crystal oscillator circuit and a reset circuit; the first temperature and humidity sensor and the second temperature and humidity sensor both adopt the SHT11 type intelligent temperature/humidity sensor; the multiple The channel selection switch adopts CC4051 analog switch; the communication module adopts MAX1487.

The power module includes an AC220V power supply for supplying power to the heater module and a first to second power conversion circuit; the first power conversion circuit is used to convert AC220V into DC5V, and provides power for the main control module, The communication module and the multi-way selector switch supply power; the second power conversion circuit is used to convert the DC5V output by the first power conversion circuit into DC3.3V, and provide power for the first temperature and humidity sensor and the second temperature and humidity sensor Power supply; the first power conversion circuit uses a transformer and a three-terminal regulator integrated circuit 7805; the second power conversion circuit uses AMS111733.

The following are specific embodiments of the utility model.

As shown in Figure 1, the substation anti-condensation monitoring device involved in the utility model is composed of a temperature and humidity sensor, a main control module, a power supply module, a heater module, a multi-channel selection switch, and a communication module for communicating with an upper computer, etc. Among them, there are two temperature and humidity sensors, one is responsible for collecting the temperature and humidity of the high-voltage power distribution room in the box-type substation, and the other is responsible for collecting the temperature and humidity of the low-voltage power distribution room. After the two temperature and humidity sensors process the collected data, they transmit the data to the main control module under the control of the multi-channel selector switch; the main control module is responsible for judging, analyzing and processing the temperature and humidity data. Control the work of the heater module and send the data to the host computer through the communication module; the heater module is responsible for heating and dehumidifying according to the set value, when the measured humidity is greater than the set upper limit humidity or the measured temperature is lower than the set lower limit When the temperature is high, the heating plate of the heater module is started to work. When the measured humidity is less than the set lower limit humidity or the measured temperature is greater than the set upper limit temperature, the heating plate is stopped; the power module is responsible for supplying power to each circuit module; To display and set various parameters, this embodiment is also connected to a host computer. The main function of the host computer is to set the upper and lower limits of temperature and humidity, and is responsible for real-time communication, monitoring and alarming. When the temperature and humidity of the monitoring point exceed or fall below the set If the fixed value lasts too long, the upper computer will send out a warning signal, and at the same time send the signal to the abnormal terminal to make it send out an alarm, which is convenient for the on-site staff to quickly and accurately judge the abnormal point and deal with it.

The selected device models in the utility model are: the temperature and humidity sensor selects SHT11 digital temperature and humidity sensor, the main control part selects single-chip microcomputer PIC16F887, the communication part selects MAX1487, and the multi-channel selection switch selects CC4051 analog switch. Among them, the working voltage of MAX1487, PIC16F887 and CC4051 analog switch is DC5V, and its power supply method is to use a transformer to convert AC220V to DC12V, and then reduce DC12V to DC5V through a three-terminal voltage regulator integrated circuit 7805. The voltage regulator circuit is shown in Figure 2 Show. The operating voltage of the SHT11 digital temperature and humidity sensor is DC3.3V, and its power supply method is to use AMS111733 to convert DC5V into DC3.3V. The heating plate of the heater module needs to be powered by AC220V power supply, as shown in Figure 3, in order to prevent the single-chip microcomputer from being disturbed, it is necessary to use optocoupler isolation to isolate the operating power supply of the single-chip microcomputer from the heating plate, and in order to achieve real isolation, the photoelectric coupling Input and output cannot share ground.

The SHT11 sensor is a single-chip fully calibrated digital output relative humidity and temperature sensor composed of two sensor modules. The chip contains a relative humidity sensor, a temperature sensor, an amplifier, a 14-bit A/D converter, and a calibration memory (E2PROM) , random access memory (RAM), status register, cyclic redundancy check code (CRC) register, two-wire serial interface, control unit, heater and low voltage detection circuit. SHT11 combines the temperature sensor and the humidity sensor together, which can improve the measurement accuracy. It has a 14-bit A/D converter on-chip, and can output 12-bit and 8-bit programmable in the form of I2C bus. The system uses two general-purpose I/O lines of the microcontroller to virtualize the I2C bus. The working sequence of the I2C bus is simulated through the programming of the single-chip microcomputer, and the collection of temperature and humidity data is completed. SHT11 products have good interchangeability, fast response, strong anti-interference ability, no external components, and are suitable for various single-chip microcomputers. In practical applications, it should be noted that when the MCU is connected to the SHT11, a 100nF decoupling filter capacitor must be added between the power supply pins (VDD, GND), and an external pull-up resistor (10-20nF) is required at the DATA connection port. ), as shown in Figure 4, where the DATA pin port is used to read and write sensor data, when a write command is to be sent to SHT11, that is, when the MCU sends an instruction to collect relative humidity and temperature data to the sensor, DATA is on the rising edge of SCK Valid and must remain stable while SCK is high. At this time, DATA will only change after the falling edge of SCK. When you want to send a read data command to SHT11, that is, the sensor will send the collected data to the microcontroller after a series of changes such as internal amplifier amplification and analog-to-digital conversion to determine whether to start or stop the heating plate. At this time, DATA is valid after the falling edge of SCK and remains until the next falling edge of SCK. When sending a write command to SHT11, the DATA line is controlled by the microcontroller; and when it wants to send a read command to SHT11, the DATA line is controlled by the SHT11 sensor. And in order to ensure communication security, the effective time of DATA should be extended for a period of time before the rising edge of SCK and after the falling edge of SCK.

As shown in Figure 5, the X0 and X1 pins of CC4051 are used to control the clock lines of two SHT11 sensors respectively. When X0 outputs a high level, the first SHT11 sensor will collect the temperature and humidity value of the high-voltage power distribution room; similarly, when X1 outputs a high level, the second SHT11 sensor will collect the temperature and humidity value of the low-voltage power distribution room.

As shown in Figure 6, the communication module is responsible for transmitting data between the MCU and the host computer. Connect pins 2 and 3 of the MAX1487 to pin 24 of the PIC16F887, and pin 24 should be set as an output. If the output is high, then send Enable; otherwise, receive enable.

The utility model can effectively prevent the occurrence of condensation in the cabinet of the box-type substation, and improves the reliability and safety of the operation of the box-type substation. Not only can the work intensity of the staff be reduced, but also possible accidents can be dealt with more quickly and accurately.

The above are the preferred embodiments of the utility model, and all changes made according to the technical solution of the utility model, when the functional effect produced does not exceed the scope of the technical solution of the utility model, all belong to the protection scope of the utility model.

Claims (7)

1. the anti-condensation supervising device of transformer station, it is characterized in that: multidiameter option switch, heater module, the alarm module that comprises main control module and be connected with this main control module and the communication module communicating with host computer, also comprise that one is used to the power module of whole device power supply, described main control module is also connected to the clock line of a Temperature Humidity Sensor module, and described multidiameter option switch is also connected to the data line of described Temperature Humidity Sensor module; Described Temperature Humidity Sensor module comprises the first Temperature Humidity Sensor for gathering the high voltage power distribution room temperature humidity in box-type substation and for gathering the second Temperature Humidity Sensor of the low-voltage distribution room temperature humidity in box-type substation.

2. the anti-condensation supervising device of transformer station according to claim 1, is characterized in that: described main control module adopts PIC16F887 chip, and adopts 4MHz crystal oscillator, and peripheral hardware crystal oscillating circuit and reset circuit.

3. the anti-condensation supervising device of transformer station according to claim 1, is characterized in that: described the first Temperature Humidity Sensor and the second Temperature Humidity Sensor all adopt the intelligent temperature/humidity sensor of SHT11 type.

4. the anti-condensation supervising device of transformer station according to claim 1, is characterized in that: described multidiameter option switch adopts CC4051 analog switch.

5. the anti-condensation supervising device of transformer station according to claim 1, is characterized in that: described communication module adopts MAX1487.

6. the anti-condensation supervising device of transformer station according to claim 1, is characterized in that: described power module comprises and is used to the AC220V power supply and first of described heater module power supply to second source change-over circuit; Described the first power-switching circuit is used for converting AC220V to DC5V, and is described main control module, communication module and multidiameter option switch power supply; Described second source change-over circuit converts DC3.3V to for the DC5V that described the first power-switching circuit is exported, and is described the first Temperature Humidity Sensor and the power supply of the second Temperature Humidity Sensor.

7. the anti-condensation supervising device of transformer station according to claim 6, is characterized in that: described the first power-switching circuit adopts transformer and circuit of three-terminal voltage-stabilizing integrated 7805; Described second source change-over circuit adopts AMS111733.